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I am trying to use screen with another user than I logged in. The command is started with:

sudo -u user /usr/bin/screen -A -m -d -S screen ./nice_command

For reattaching I am using screen -x screen, but it always says:

There is no screen to be attached matching screen

What is my mistake?

EDIT:

screen -x user/22969.screen
There is a screen on:
        22969.screen       (12/13/2011 11:37:43 PM)        (Private)
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Do a screen -ls to see which screen sockets you have and what their names are. –  micke Dec 13 '11 at 22:18
    
I got following output No Sockets found in /var/run/screen/S-root. . –  CSchulz Dec 13 '11 at 22:21

1 Answer 1

Since you did su -u user to get a screen session it now belongs to user.
You need to do sudo -u user screen -x screen to attach to it.

Or specify the path to it ( screen -x user/[pid].screen ) if the screen is in multiuser mode and you have access to it. screen -ls user/ will give you info on sessions for user.

For multiuser screen to work you need to have it enabled ctrl+a:multiuser on and add users ctrl+a:acladd root (or other user). This is done from within screen.
Screen also needs to be setuid chmod u+s $(which screen) and screen sockets dir must be readable. (This is almost always the case already).

(good guide here: http://aperiodic.net/screen/multiuser )

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It seems that the screen is private and that is the reason why I can't reattach it (see above). –  CSchulz Dec 13 '11 at 22:55
1  
I edited my post to include info about multiuser screen sessions. –  micke Dec 13 '11 at 23:19
    
Thanks, there is a missing spell in multiuser. Is there any possibility to do that over a shell script or anything like that? –  CSchulz Dec 14 '11 at 7:35
    
Put multiuser and acladd lines in the config file .screenrc. I found a good guide here: aperiodic.net/screen/multiuser –  micke Dec 14 '11 at 8:41

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